Thanks for making this gem printable! It's really sturdy and should stand a lot of fidgeting (did a well job on this today).
I Had to clean the bottom hinges with a file, so they could actually be opened for almost 180°. The results are ok now. All other hinges work perfectly fine!
Any reason for not suggesting build-plate support? I think it would have fixed the problems with the bottom hinges.
Another suggestion mentioned somewhere else: maybe rounding the sharp edges just a little would stress the skin a little less.